Waterproof cement and method of producing it.



I06. COMPOSITIONS,

COATING OR PLASTIC.

UNITED STATES 1; i 4. 2 4' I a! g PATENT OFFICE.

DONALD DAVIDSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO BRADLEY & VBOOMAN COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

WATERPROOF CEIMENT AND METHOD OF PRODUCING I'I.

No Drawing.

To all whom it may concern:

Be it known that I, DONALD DAVIDSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Waterproof Cement and Methods of Producing It; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of the invention is to provide an inexpensive waterproofing material for Portland or other cement having the property of hydraulicity which can be added to thg water with which the cement is to e mixed and wh1c will render the resultin cement, when set, lmpervlous to Water.

e Waterproofing material which I use is a by-product of petroleum refining ap d isthat oxidat on promeknown as naphthenic I riispuffannia criua tion pr'cidii't consists of acids which comport themselves very similarly to fatty acids. The naphthenic acids may also be produced directly y but mostly they are the result of refining petroleum. They are found chiefly as a by-produg nibumn nn ln s gggg gm e chemical formula 0 gap er 1 1c acids is supposed to be C,H, COOH up to C H,,COOH, and naphthenic acids of commerce are usually mixtures which may consist substantially of any variation or proportions of acids included between the limits above indicated by the two formulas. The

htheni ids of commerce may be used irect v or my ma e neutra ize W1 40 some a al1n1c solution, preferabIy a solutlon ome ammonium salt. The soIution or liquid resdl'tmls mixture is mixed with the water used in mixing the cement to form the mortar or concrete. The water used for making the mortar may contain about one-quarter of one per cent. of the said naphthenic acids, though the limits may vary somewhat. The naphthenic acids contained in the water with which the cement is mixed millarggt with the lime or otheppresent or adde su stance adapted to fbrm msolubTe na lithenates 1n the "c'emen't, or'wlffi other metaIIic com un s w 10 may be added for that purpose, such as ban'gm or aluminum Specification of Letters Patent.

Patented Nov. 26, 1918.

chlorid, and form an insoluble naphthenate in e nishecI cement.

Whether the napfithenic acid be added directly, as such, or in combination with a suitable base, is a matter of little difference as the final effect is the same. mithgmig acids and naphthenates are to be regarded as e uivafents 1n the present relation.

II1e naphthenic acids are considerably cheaper than the fatty acids sometimes used for the same purpose and make a better Waterproofing cement than that resulting from the addition of fatty acids to the cement for waterproofing it. The peculiar advantage of naphthenic acids over fatty acids used for this purpose is their property of forming alkaline salts, which are readily soluble and which fomerject ohitionsin water whereas the fatty acids form ropy, thick or gelatinous solutions which retard the uniform distribution of the waterproofmg agent through the mass of the Water and the cement formed therewith, and are not so readily soluble.

In cases where caustic soda is used in place of ammonia or neu ra izing naphthenic acids, the proportions indicated below may be used in preparing the waterliquid will be a clear solution of slight viscoslty. By mixing one part of the resulting solution with thirty parts of the water,

to be used in forming the mortar or concrete, the resulting cement or concrete will be made waterproof.

.My invention is applicable generally to cements having the quality of setting, as will be seen from the above.

I claim:

1. A waterproof cement comprising calcium naphthenate.

2. The process of rendering cement waterproof which consists in mixing therewith a small percentage of a naphthenic compound adapted to react with a calcium compound present in the cement to form in the body of the cement calcium naphthenate.

3. The process of rendering cement waterproof which consists in mixing the cementitious material with a solution of naphthenic compound, which compound is adapted to react with the calcium hydroxid presnaphthenate to change the lime in the body of the cement into calcium naphthenate.

7. A waterproof cement including an insoluble metallic naphthenate.

8. The process of rendering cement waterproof, which consists in mixing therewith a percentage of a naphthenic compound adapted to react with a metallic compound present in the cement to form in the body of the cement an insoluble metallic naphthena-te. c.

9. The process. of rendering hydraulic I concrete waterproof-,which consists in mixing with the concrete before setting begins,

a solution of a naphthenic acid salt.

In testimony whereof I afiix my signature.

DONALD DAVIDSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratentl, Washington, D. 0." 

